Nissan Titan A60. Manual - part 451

EC-470

< SYMPTOM DIAGNOSIS >

[VK56DE]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM

Reference 
page

HARD/NO ST

AR

T/REST

AR

T (EXCP

. 

HA)

E

N

GI

N

E

 ST

AL

L

HESIT

A

TION/S

U

R

GING/F

LA

T SP

OT

SP

ARK KNOCK/DE

T

O

NA

TION

LACK OF POWE

R/POOR

 ACCELERA

TIO

N

HIGH IDL

E/L

OW

 IDL

E

ROUG

H IDLE/HU

NTING

IDL

ING VIBRA

T

ION

SLO

W

/NO RETURN T

O

 IDLE

OVERHEA

T

S/W

A

TE

R

 TEMPERA

T

URE 

HIGH

EXCES

SIVE F

U

EL CONSUMP

T

ION

EXCES

SIVE OI

L CONSUMP

T

IO

N

BA

TTE

R

Y 

DEAD (UN

D

E

R

 CH

A

R

GE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

Fuel

Fuel tank

5

5

FL-6

Fuel piping

5

5

5

5

5

5

FL-5

Vapor lock

—

Valve deposit

5

5

5

5

5

5

5

—

Poor fuel (Heavy weight gasoline, 
Low octane)

—

Air

Air duct

5

5

5

5

5

5

EM-25

Air cleaner

EM-15

Air leakage from air duct
(Mass air flow sensor — electric 
throttle control actuator)

5

5

5

5

EM-25

Electric throttle control actuator

EM-25

Air leakage from intake manifold/
Collector/Gasket

EM-25

Cranking

Battery

1

1

1

1

1

1

1

1

PG-76

Generator circuit

CHG-20

Starter circuit

3

STR-16

Signal plate

6

EM-96

Park/neutral position (PNP) sig-
nal

4

TM-50

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-74

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-96

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-52

Camshaft

EM-58

Intake valve timing control

EM-58

Intake valve

3

EM-74

Exhaust valve

ENGINE CONTROL SYSTEM SYMPTOMS

EC-471

< SYMPTOM DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1 - 6: The numbers refer to the order of inspection.

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-30

Three way catalyst

Lubrica-
tion

Oil pan/Oil strainer/Oil pump/Oil 
filter/Oil gallery/Oil cooler

5

5

5

5

5

5

5

5

LU-11

, 

LU-

14

 , 

LU-14

 , 

LU-12

Oil level (Low)/Filthy oil

LU-8

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-15

Thermostat

5

CO-23

Water pump

CO-21

Water gallery

CO-6

Cooling fan

5

CO-19

Coolant level (Low)/Contaminat-
ed coolant

5

CO-10

NVIS (NISSAN Vehicle Immobilizer System — 
NATS)

1

1

SEC-3

SYMPTOM

Reference 
page

HARD/NO S

TA

R

T/RES

TA

R

T (E

XCP

. HA)

E

N

GINE

 ST

ALL

HES

IT

A

TION/SURGING/FLA

T

 SPOT

S

P

ARK KNOC

K

/DET

O

NA

TI

ON

LACK OF 

POWER/POOR ACCELERA

TION

HIG

H

 IDL

E

/L

OW

 ID

LE

ROUGH IDLE/HUNTING

ID

LING VI

BRA

T

ION

S

LOW/NO RETU

RN 

T

O ID

LE

OVERHEA

T

S

/W

A

TER TEMPERA

T

URE HIG

H

E

XCESSIVE

 FUEL CON

S

UMP

T

ION

E

XCESSIVE

 OIL 

C

O

NSUMP

T

ION

B

A

TTER

Y 

DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

EC-472

< SYMPTOM DIAGNOSIS >

[VK56DE]

NORMAL OPERATING CONDITION

NORMAL OPERATING CONDITION

Fuel Cut Control (at No Load and High Engine Speed)

INFOID:0000000006158951

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine

speed over is 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies

based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under 

EC-23, "System Description"

.

Sensor

Input signal to ECM

ECM function

Actuator

TCM

Neutral position

Fuel cut control Fuel injector

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor

Engine coolant temperature

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Wheel sensor

Vehicle speed*

FUEL PRESSURE

EC-473

< PERIODIC MAINTENANCE >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

PERIODIC MAINTENANCE

FUEL PRESSURE

Fuel Pressure Check

INFOID:0000000006158957

FUEL PRESSURE RELEASE

 With CONSULT-III

1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-III.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.

 Without CONSULT-III

1. Remove fuel pump fuse located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel

pressure.

4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.

FUEL PRESSURE CHECK

CAUTION:

• Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.

• Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick

connector o-ring maintains sealability.

• Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.

• Do not perform fuel pressure check with electrical system operating (i.e. lights, rear defog, A/C, etc.).

Fuel pressure gauge may indicate false readings due to varying engine loads and changes in mani-

fold vacuum.

NOTE:

Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-

sure cannot be completely released because A60 models do not have fuel return system.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release J-45488. Refer to 

EM-26, "Removal and Installation"

.

• Do not twist or kink fuel hose because it is plastic hose.

• Do not remove fuel hose from quick connector.

• Keep fuel hose connections clean.

4. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure

Gauge (from kit J-44321) as shown in figure.

• Do not distort or bend fuel rail tube when installing fuel pres-

sure gauge adapter.

• When reconnecting fuel hose, check the original fuel hose for

damage and abnormality.

5. Turn ignition switch ON (reactivate fuel pump), and check for

fuel leakage.

6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge.

• During fuel pressure check, check for fuel leakage from fuel

connection every 3 minutes.

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